Homework Help: physics

Posted by Anonymous on Sunday, February 28, 2010 at 6:34pm.

A toaster uses a Nichrome heating wire. When the toaster is turned on at 20°C, the initial current is 1.50 A. A few seconds later, the toaster warms up and the current has a value of 1.20 A. The average temperature coefficient of resistivity for Nichrome wire is 4.5 10-4 (C°)-1. What is the temperature of the heating wire?

physics - drwls, Sunday, February 28, 2010 at 8:07pm
In steady state, the resistance is higher by a factor 5/4 because the current is lower by a factor 4/5.

Calculate the temperature rise necessary to increase the resistance by 25%. usng the temperature coefficient of resisitivity.

That will be the answer
physics - Anonymous, Sunday, February 28, 2010 at 11:12pm
how do i do that
physics - paul, Monday, May 7, 2012 at 9:54pm
360

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